Nested exposures, defined in inherited entities, should be merged with same nested exposures from parent classes

ruby-grape#63

Author: AMar4enko

lib/grape_entity/entity.rb

@@ -195,7 +195,7 @@ def nested_exposures
         value = nested_exposures_hash
 
         if superclass.respond_to? :nested_exposures
-          value = superclass.nested_exposures.merge(value)
+          value = superclass.nested_exposures.deep_merge(value)
         end
 
         value

spec/grape_entity/entity_spec.rb

@@ -155,14 +155,14 @@ class Parent < Person
             ClassRoom.represent({}).serializable_hash.should == {
               parents: [
                 {
-                  user: { id: "value", in_first: 'value' },
+                  user: { in_first: 'value' },
                   children: [
                     { user: { in_first: 'value', user_id: "value", display_id: "value" } },
                     { user: { in_first: 'value', user_id: "value", display_id: "value" } }
                   ]
                 },
                 {
-                  user: { id: "value", in_first: 'value' },
+                  user: { in_first: 'value' },
                   children: [
                     { user: { in_first: 'value', user_id: "value", display_id: "value" } },
                     { user: { in_first: 'value', user_id: "value", display_id: "value" } }